Microchip HV6810WG-G: High-Voltage LED Backlight Controller for Automotive Displays

The demand for advanced, high-brightness, and reliable displays in automotive applications—from digital cockpits and center stack units to heads-up displays—continues to grow. Meeting the stringent requirements of the automotive environment requires robust and highly integrated solutions. The Microchip HV6810WG-G is a high-voltage LED backlight controller designed specifically to address these challenges, offering exceptional performance, flexibility, and reliability.

At its core, the HV6810WG-G is a boost controller with integrated high-side current sensing and diagnostics. It is engineered to drive long strings of series-connected white LEDs, which are commonly used to backlight modern LCD panels. A key advantage of its architecture is the ability to support very high output voltages (up to 60V or more), enabling it to power a single, long LED chain from a typical automotive battery input voltage range (9V to 18V, with surges up to 40V). This eliminates the need for multiple, less efficient power stages and simplifies the overall system design.

Precision and reliability are paramount in automotive electronics. The device incorporates multiple PWM (Pulse Width Modulation) dimming channels with individual fault detection. This allows for sophisticated local dimming strategies, enhancing display contrast ratios and reducing overall system power consumption. Dimming can be controlled via a dedicated PWM input or through an I²C interface, providing designers with flexibility for different system architectures.

A critical aspect of the HV6810WG-G is its comprehensive suite of built-in diagnostic and protection features. It continuously monitors for open-LED, shorted-LED, and over-temperature conditions. In the event of a fault, the device can be configured to either shut down safely or report the status back to a host microcontroller via the fault flag pin or the I²C bus. This proactive health monitoring is essential for achieving Automotive Safety Integrity Level (ASIL) compliance and ensuring functional safety within the vehicle.

Furthermore, the controller is designed for low electromagnetic interference (EMI), a critical requirement to prevent noise from disrupting sensitive AM/FM radios and other vehicle receivers. Its switching frequency can be synchronized to an external clock, helping to push noise emissions away from critical bands.

The HV6810WG-G is offered in a compact 20-lead TSSOP package and is qualified for the rigorous AEC-Q100 automotive standard, guaranteeing its performance across the extreme temperature ranges and harsh operating conditions found in automobiles.

ICGOOODFIND: The Microchip HV6810WG-G stands out as a highly integrated and robust solution for automotive LED backlighting. Its high-voltage capability, precision dimming, extensive diagnostic features, and ASIL-ready design make it an excellent choice for engineers developing next-generation automotive displays that demand performance, safety, and longevity.

Keywords: Automotive LED Backlighting, High-Voltage Boost Controller, PWM Dimming, Integrated Diagnostics, AEC-Q100.